codependent fontcest where Papyrus isn't actually dumb, he just pretends to be because he knows that if Sans feels like Papyrus doesn't need him to take care of him, then he won't see a purpose in living anymore.
codependent fontcest where they used to do literally everything together (sleeping, showering, etc.) until Papyrus casually mentioned that to Undyne or smth, thinking it was normal, only to be met with a reaction that can only be described as: 😟. He got embarrassed and told Sans that apparently it wasn't normal to do that (Sans didn't know either) so they stopped, but they both lowkey miss it.
codependent fontcest where Sans doesn't really mind that Papyrus doesn't have many friends (even if he'd be supportive if he made some) because he likes it just the two of them.
codependent fontcest where they both know on some level that their relationship is probably incredibly unhealthy, but what else are they supposed to do? It's always just been them. They only need eachother.
Lowkey I think the codependency could either be a result of them being Gaster chunks (they want to be a whole person again, even though they don't even know it, which is where a lack of knowledge of their world's norms would come from too) or both of them being from Deltarune originally (they miss their home, and the other is the only one who understands that) or some combination of the two.
UHHH FONTCEST SHIPPERS INT PLEASSSEEE I need to yap about them to someone.